Since getting your degree have you come across a problem/situation that you didn't study? 

@Michael KistnerMake sure that your rental income covers your basis and you can support your living situation with the job.

I'll be honest, I've had a pretty stressful time of it too lately.

That seems stressful, but the property is likely to appreciate well...I will probably be putting 10% down in any of these opportunities, since I don't get cash flow on the multi units if I put down less than 10%.What are your thoughts?

In my experience inherited tenants can be the Achilles tendon in any rental situation.

Unless he has connection to a very good GC experienced in the area and referred by people he knows, this spells out a bad situation.  

I'll share a bit of information about them too because I think there is real value for readers in seeing the totality of my situation with real estate investing.

I think the view on landlords or managers can quickly shift based on the situation, particularly - as you mentioned - evictions and rent increased, or if we don’t bend the rules as much as one might like.I’ve been called all sorts on names.

I understand looking for positive cash flow is a good proxy to avoid making bad deals when you’re a beginner, but if you’re careful in your estimates and run the numbers properly, I would believe you can still enjoy a decent return on your property even if your initial cash flow is inexistent.Let’s take the example of a zero-CF property (i.e. it’s zero after opex, capex, vacancy, PITI, property management etc..) in the following situation: I put down 20% as down payment for a 30 years loan, at 4.5%The property doesn’t appreciate over the years and I sell the property after 30 years for the same priceI incur 5% closing costs at purchase, and 5% selling cost when exitingI assume no inflation (hence selling price = acquisition price)In this context, my IRR would be 4.55%.

If you are a serious investor, you need a good lawyer to setup the correct structure for your current financial situation.